The validation of mission systems and subsystems is one of the most important aspects of the mission to be successful in a space mission. This entails comprehensive testing of interfaces and functions involved in such a large system composed of many components, such as satellites, host platforms, payloads, instruments, and avionics. With Digitistic as the forerunner, Satellite Systems for Satellite Payloads has turned into a new domain that is associated with the creation and design of the latest Checkout Systems.